A mosaic of infrared images taken at night by w:THEMIS over Gratteri Crater, w:Mars. Each w:THEMIS observation is 32 km across (320 pixels across with a nominal pixel resolution of 100 meters per pixel).
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The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]